Answer: Choice C) 87.55 square cm
============================================================
Step-by-step explanation:
Rotate the triangle so that the side 17 cm is completely horizontal and the triangle is pointing upward. The 10.3 cm portion is the height. The base and height are always perpendicular to one another.
Area = (base*height)/2
Area = (17*10.3)/2
Area = 87.55 square cm
The sides 12 cm and 15 cm are not needed at all. They might have been put in there as a distraction.